<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <!-- 头像 -->
        <img src="../assets/logo.png" alt="avatar_img">
      </div>
      <!-- 表单区 -->
      <el-form label-width="0" class="login_form" :model="loginForm" :rules="loginFormRules" ref="loginFormRef">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user" v-model="loginForm.username" placeholder="用户名"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input type="password" prefix-icon="el-icon-lock" v-model="loginForm.password" placeholder="密码"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data () {
    return {
      // 登录表单数据对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则
      loginFormRules: {
      // 验证用户名
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 5, max: 15, message: '长度在 5 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    // 登录方法
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) return 0
        const { data: res } = await this.$http.post('login', this.loginForm)
        console.log(res)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        // 登录成功
        this.$message.success('登录成功')
        // 1、登录成功后，将token保存到sessionLocalStorage
        // 1.1、跨域，使用token
        // 1.2、token只应该在网页打开期间生效所以使用sessionStorage
        // 2、通过编程导航跳转到home页面，路由地址'/home'
        window.sessionStorage.setItem('token', res.data.token)
        // 页面跳转
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container{
  background-color: #2b4b6b;
  height: 100vh;
}
.login_box{
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top:50%;
  transform: translate(-50%,-50%);
  .avatar_box{
    height: 130px;
    width: 130px;
    border:1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
      height: 100%;
      width: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.btns{
  display: flex;
  //尾部对其
  justify-content: flex-end;
}
.login_form{
  position: absolute;
  bottom:0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
